OfType doesn’t work anymore in c# with mongo db driver 3.0

Hello,

I have the following filter in my c# application

var filter = Builders.Filter.Where(p =>
p.UserIntegrations.OfType ().Any(a =>
a.Identifier == shopName)
);

This used to work correctly but after upgrading to mongodb driver 3.0 it stopped working with error

Expression not supported: p.UserIntegrations.OfType()

Any ideas?
Thanks
Yannis